While at this FSB we took a few small arms rounds. Soon after the gunship was on the job doing what they do best. Just outside the perimeter I was clearing bush and found myself on top of a tunnel complex. The way I found out was that my dozer caved in the top. After clearing the area a tunnel rat went in and explored it. After getting out the complex was destroyed. We were at this FSB just as Tet 68 started. I remember what seems a 24 hour 105 barrage. My bunker was right under their firing line. About a day after we hastily left and went back to the BMB. On the way we took small arms fire but a two APC with their 50 cal and a LOH dropping grenades quieted them down. We got back ok.